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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae200f99cab62cc3ad6315f5ed1e5226a038778e15999de4b11cd178f7219494' 
  AND token = 'PsFmXI2qmOpy3NrNsfTI8baunwoTu9kCTV3j45SAW2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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