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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47f98f1ef2a05e68f8da44baecfb45be15a62a16c8fd94654803924dec49c65' 
  AND token = '8kH9WoWBLE68JCcd4+lXVu4mTtimuaSaVUl0xPJ8E9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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