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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f2f36f22dfd6f0ef2f6297d3cebb1c97cee59cdaae4389a928ea8cc711bc4c' 
  AND token = 'moBfCBzDiXX1V8XJ6rg0RY9N6wzQRjWePkVB9aYJW8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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