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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace251c6ad0da45ea724e36d740cc51dd77ef2be4264fc5f2ec890045c3ea7f0' 
  AND token = 'kCCgAyqVT5UX/R7LWLSME5tnFaSvBjfyTdJZA5shr2I=' 
  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"
    }
  }
}