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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a78d87ff9d026a50c42e4b657dc1f37e01a33dd1ebd42405c21fe1a7f98207' 
  AND token = 'ecSUHCh3m3x3Xr4Smc1Iiha6dSVrnXGO6l4uwtpUBIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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