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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f28be38ff5e833d3b2f22ebd86a32d63c0469d9543a000ddce9e71c12ddfb1' 
  AND token = 'hY4Ny7k3+fxEdMNnfqSREspKI3Y57W6Z7wr0xq8BjpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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