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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367ae7283d1d14ca4296ba9083f841a8010414d23cbc4b72030617b29ad4cc6d' 
  AND token = 'sCUKnOW4t0BY+RPBZBfKD/dK2u468/P5tQz+ydav9Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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