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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6b11c19d3a31a91c03ae42894e6ef0eefa3c3174df876c6215e272262351fc' 
  AND token = '3kcq1jYQJAriElEnzV47oZayuoOLMz7d5F9Wg6FNDGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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