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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c37b389abbf07f787c7a68dc8449cfd158507b94d358ba04c0b737057d77a42' 
  AND token = 'rJzDJyJVL9/5R4Uset6mye0kglnYyYiuSp86DzKDLl4=' 
  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"
    }
  }
}