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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f4119d737b55f6a06c28c4e2d8900678b2f5ddcdefde75371fc66de89ebe6e' 
  AND token = '57swdMWz8umOv/85L8sSiPqyVcey2Y7jwQGKWlYaJZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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