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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30ff4b59f20202569d8a08632cd90a1e2501a54371aa2d5cdf435d8661b5128' 
  AND token = 'j1Qn18MT/CMemVTyOIk6URfjBSsPYmm48MYukh5WpKs=' 
  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"
    }
  }
}