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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822b3f04eb2c98c851fc2cbd914dd20c111ee34dddcf51923eb20d78d7701ca8' 
  AND token = 'B0/a2L7IU5JXKU/p0CUvBXGkTxsNce1k456QiieoNuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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