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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a5f1106b4ef9be6508e2fecafbd32e0276cf67e7f66c28e86bef1251adab98' 
  AND token = '09Ekg0Bm9aaBklT10+1DwNxQ8hTPeGmKyfJq2ExM61E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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