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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b576379b3ba4aa81274f793f86f9b92a394af03d662460b0dc12855475b6c9ab' 
  AND token = 's1MD5aR4bfnetwKYey+kJLlY8ULyLqfU+WKTWDHouu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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