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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060091ec17c4732490c4f52179679d7f3c66a37714c8d2632c5875380256b37f' 
  AND token = 'Xk4JsYkoMpObbt/nvgEJ7/RSWCeUCbxuDwwp3EU3i/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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