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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ce3cd96eb8993481400a24f2f8de4a45f11d65b69f9a233084a594e4f20e11' 
  AND token = 'ovQam02u851CtsUwhQYHgwpo0xx6rFgFY8dGoo0YS2E=' 
  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"
    }
  }
}