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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202db2bf711befcc0555b0e4db4791ea33f0e7ec65a24a748bff1fd8b8f4bc7a' 
  AND token = 'mpobLAYRf4svxN3nz4oGvWbaUx+WKT63XAIiCVD5LBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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