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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856c6c420aa3e179429f7f1cd604b5782f8a33607d1cc24f71517076c5e51c8f' 
  AND token = 'ln69CCf8JiqrA63jwoGNEuYbWNNnjSvODLBNddWlKDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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