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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f6e4b8334d3ed3720918becc1ee433dd70ca13b00f8a5f1263dfe203ffea0a' 
  AND token = 'Q+DxVUEC3OK4eOqX3RBdYqq0C+l/cGwWvR/lrZ0eMgs=' 
  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"
    }
  }
}