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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9c2f2dc6f4514fc3257839c1e8d5cc8c0d2885a24cbac25b6d02c1e733a754' 
  AND token = 'ZHX51GYWvfmHlIP9TPmqwQ/8Hpco4Px91SZVANLU8tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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