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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87100e71ae9fcdf555824d8e503f4328b873a6f28c8d4d87b6bb50fea964072b' 
  AND token = '1dINn/GzA/h6HgiAPn/7XE3Es8ECJ1osUK7Tnk6BjOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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