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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e3b898d198060bc341681c88d1f9a846ca162e3968cb5cea1cc8203a166ec0' 
  AND token = '3HtVsZ0P+rnwmBdPDs9RGLeMzaXjl6F+7otM7/0UZuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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