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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66935b9426061608de652da850852cb6b5e2d62d4de6c4da6138cb2e2d227fc0' 
  AND token = 'CGd9vi4zVu5vLs0unBuLr3VuULJM2A1+emmdJgIDJTE=' 
  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"
    }
  }
}