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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecc87e074c7079ec6fc47a3baf617b5a654e04ae8e59857a21a969b6fab75b3' 
  AND token = 'bS7+IbKs8zpDnGulkHuIzMT1HmyZlLuB1Oxz/oS+O9A=' 
  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"
    }
  }
}