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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81b44b5ccdb104abdd9a3eb4718c4d37a64837f0e0468b635f8ec613d62abd80' 
  AND token = 'eZXYXR6Rk+nLMZ505XQr9ayWsUxI3YBXx2l1NekVef4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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