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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a2e24eadeae305c90b4cae0d23ee443ed3223f21979d4fb9bd7dd5202645af' 
  AND token = 'jsYFroPXfzrsxT2em2dv1BK2ngz9xqI8rwhSrLGsS0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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