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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ff212d7eb7775d4d65c852eec6844223c1be7bb514b9eed2344aee6e371dcb' 
  AND token = 'NV1m3LxIS2gCN1Jn9wNL04zWBm6qXhQkr+p1mCs/m18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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