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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef842df717bab8acdfbd1803b532052455febe26b84bf3a82ca8ebbeb746fc80' 
  AND token = 'IRtbf4MNXCqfjE8i38SRR1VZmb3hFp8m8DExFZsH3v0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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