SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca34d56e6beeb6147523bf9373215e6cc47c69aa3767ef5304b66a682c7290df' 
  AND token = 'E+vSy+F+Jw/zMJ5qPm94OxFETWMhujYRLbLBR8VxDFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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