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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b63bc8d9585d76e4d2f2741219ba16b36e9c5d1e61cb813d9ae06abdf7e9a77' 
  AND token = 'hqdZ+yZMbOpNBinyoNql/2o7eaMLSxqn7Jn8YannC3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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