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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e55dffe72781f78bcab5cf6dcc46905b45d26cc9fc4edd5e58cb033c779497f' 
  AND token = 'K/G5UNQp3NqfkQ5GXQ2D8gl9e+r49tYg2WaP7q1RBls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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