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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcefd2159e4c91074462e43e125c89191b97074972328a6cb5d97b97ce2e2a1d' 
  AND token = 'x6lHw3gZt8FsRtxMRgDnj+LXSdA8m42HAb+rTULu6Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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