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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36df74e8c93ac8feb10700cabb8104168348a1688dffab7fdbab011e657f60d6' 
  AND token = 'pXKE4NBFJ0MpqWrj4i5GygvnHsf7KrLUmlkgfvhe3lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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