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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97835f7d26fc5fd6b055b96567a3e614cf1216678eeb09c10d0b37a24e2d6b2c' 
  AND token = '2I9A9j6oAHrJJ8C4IMQ5bQKkTClqWR7zhKl8YAOVQ64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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