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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5ceee1f4c43cb7ca13315ac70ba5bc3b37bc494443ab46314a7fdf2a43153a' 
  AND token = 'j/sLinBLe1vKE1uiE53Ucc2LQDKtCGNA9p0oQxy829c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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