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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cd5172456cd1822402c217767542db5710a708f06fcee0939928196952039d' 
  AND token = 'NUMNPTYvj2hoBtbSmca/iJPq9Y1J5pql2SFSqQr7ONs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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