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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94748431f56a327b1863066768f3d36bfeaa9bdaddd920aa98c8f9073373f404' 
  AND token = 'WAaf+IfqKeMHEbA2+V5seRB+s2YU0JVQ4Gv7J1BH2pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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