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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88002a0b98a9cbb9bbbef7fe731d013bc6f8b5f69062114f8948e8ef0bf2deff' 
  AND token = 'OnPWz9uraSqHWP7nf74ljrNlXZQHET6LKzQ1W48VZ7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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