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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b41e6cdb39b02c17e4c25e78c81e9d020c1f3d8168268e3cba1dc9c6a96025' 
  AND token = 'OpKVSWN69SkFR6TSr9JTN/jYuglGZIxKTXY7gR+mIaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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