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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b1e3c4ba609cbe80489751f5ff24f8c982ca008a37fa09cd6c567575b45898' 
  AND token = 'Nq++O8Uq+9B2ZB2B+wJ6OrESxAT9mpqBxQHTsPHXiuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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