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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46810a4d4529f0d04159a5cf04d58472735054e69dcf303f06cda56460f30cb8' 
  AND token = 'af6XF2jr3HRvbHe5iRhOk2y/Z6sYiULLegcofiRak5A=' 
  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"
    }
  }
}