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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84a794f4050a3ef7bec87503f16d80c01d17ac258cbdc6e6aa0bdfd3e14aec4' 
  AND token = '5eUYeka+DWU4iy0XF2Ang4mfwpYGvm33K+zTCLUSZ44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}