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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0193d7ea19d30d3f27786c55865a0873ef47471f170025a452cc557c27291375' 
  AND token = 'N9BhtiKrnYHf2G5ywjDWh1kK4Vy2pSsef2OvQha1zPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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