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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f506229132b0c38c64e685c1e0c79cbedd87e352b7d683828359d0ac8befdf0' 
  AND token = 'KaUUHzuDYPW522s4DVQz4yGVGFMaGHJFPq2Bf8IRyj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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