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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1348278704d6ca70dda15de2d4a8f305522754b76ced20958e42c96233e5dcfb' 
  AND token = 'rg1+Dj+dBPKvbg5jL6bTtp0Bfbuco805ngGoAH0L94w=' 
  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"
    }
  }
}