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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4be0ae85da3930576a8745dd73097b0df55b635ade70bb9cec5913d5c6a920' 
  AND token = 'Y9EbvENi2as109nCdRgcVZnQvTqs0PygL8+40zxSbng=' 
  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"
    }
  }
}