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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8578b3cff0ccfbd48eb5862399d2dd37e0baa2dc79c0c9a6f13dcf1469c45665' 
  AND token = '48xyKFBXU45cd34DRlRiOx9Iys1q4SCUmFpf+uXPeKU=' 
  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"
    }
  }
}