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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f56e6fbe2fcda03e9cd6b4ae958252bbe064d3d69ed9bd39219779488a34e74' 
  AND token = 'mVP+qhihu+Dc+XxAHAutm7WRIxXCyRFTyXXi46ZJjKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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