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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a45e458ed89a2637de4db648bb5f751834ea1da0d3d467ef476701b30637f683' 
  AND token = 'vwHOUrKxBxKf0GCqUKnm3G/LCxiR9cElqSrT6KhSX2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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