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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df44bf4fd27a06c65ed1d6e852474d3b5b6cfed5336604417468b4a4afb961f' 
  AND token = '1I1Cy4uBe2BxeazMhTEMsS3IBXoV2KIZYbeMM3rzlyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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