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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f02b3098a025ad480a110fea1a27a3ac275c542e925f89d86b6279ea688281e' 
  AND token = '8xN5U/BwxSntcyFWCV36d5C2+SSLus69UoeS7F3wQEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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