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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b88ffc881de2f07b4ca0254f3c93aeebccd51aa3c7226c96d40177d5a6545a' 
  AND token = 'PKPX+k9oNAnLihbqI7c9aLsW94pwrhFB8lmutPupxDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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