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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e521afe47e506aedf9616d9c1739d30cc053d378d0041f1829a474c49e0dd96' 
  AND token = '2Ec650IRatJNegGG3KhaNQb8vhE6APIKlBlGocJ+Dvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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