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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9977f0bc22e0d4a7285c579900cae23ece55fc2c799414869c69457961d79706' 
  AND token = 'zVKmJbIJtHN4ca/5jf2Z6x16aZxRlA3NlpViv+deS8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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