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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5cdded4f0a158a61b1d569d3d927d71a8e75f9ded6cdc6ad7ce5ec73fc67f5' 
  AND token = 'HCcdirwtpn3ydWolryzb+Lrlk9u0Oj54mBZAizbDWTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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