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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd60c02855de953a163a78d9af13ed6f71a772bd6534bde01f3a5d267f07b5bd' 
  AND token = '/GuJ5e+zS4ZeDZ4/kVyeHtgdT+7uTEYz5Yl2oQdumDs=' 
  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"
    }
  }
}