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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deeabc64d174650c3812c0e58a482192670e67df2f43b19520f96b240d292abe' 
  AND token = '3cEW6U0w/G/8MxPHB9zW+7yaYL9+Lte01ClyyA0Q+iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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