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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a01b34ee98f7a16ba022b67b334b82582d2098b6f9223b3bd75009594ed208' 
  AND token = '5hSq9wiZ0B3dBPPCngT6gdHK6ePU3fINh2QKhxqR4+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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