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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80628c03ae0e29fc339948a88c119862b3904b720b1e82f7077d6dce3371e4d' 
  AND token = 'ILNS1kjRhtvvGQikM2pEz+wMtF/MQs4K8gDnx5l36Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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