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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebbfd9cbe6bcd4ed7502119b17ac67f648016e0b1d0af2c2053a099dd2231da' 
  AND token = 'WT7eSOJgFlKEdTC8Mf3HhgEutqvnh0B+0bsCh8OV9+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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