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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc71ca7e5839cd9ca416b908717cc857304fd4e64f6de58d8b2583d74f8ecbc9' 
  AND token = 'PCagmnAuhvJp0UIg9wp2RUyPnDNP8VtY2T1A84j8pQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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