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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af4904488fa52996bb1b02de0497495e30de734cdb010151b27acef1b55ee3a7' 
  AND token = 'pUpHMi9wYybDj3nk9japjW0UoP+iGQNEo2ahkWvGdCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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