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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d6555b07f44870d42f654e3f7b95d5569ff575526e8bf9370e93941ab302ce8' 
  AND token = '0CIMZniGzw/73cUH5H+CUwh9eTE+lDLaKx1Ds0LK+rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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