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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4f55676e0c5fa1e345a26c33d15881a908dc5e4f6f2d174daaa230060243a65' 
  AND token = 'Kx0w3SybefkCcEU7PWX4zZu4YQy3O49rhy1NKde3yzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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