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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01cd119c9eee6cd8dc5cffa3ee545a7539dcf11c0de81b005067fa3431a96f73' 
  AND token = 'ffhIFTuvTVIJHG2sM4v7JpPTWrxPY59tr7Wa74aWGYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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