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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381b313084b5fadc03bda197686e0b78af95c0da7759817d4ae9bbb5365e3b22' 
  AND token = 'q9jZLtbgxsFFX5WTZx1wc0zmyFzdG8Iy7ObQ/+4pdHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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